Cast return bend for oil stills and method of making the same



May 8, 1928.

F. E. KEY

CAST RETURN BEND FOR OIL STILLS AND METHOD 0F MAKING THE SAME Filed May 23. 1927 2 $heets-$heet l INVENTOIQ/ fleaosxz/cxf KEY 6 7 HTTOQ/VEY May s, 1926. 1,666,680

F. E. KEY

CAST RETURN BEND FOR OIL STILLS AND METHOD OF MAKING THE SAME Filed Kay 23. 1927 2 Sheets-$heet 2 Patent ed May 8, 1928.

UNITED STATES PATENT OFFICE.

FREDERICK E. KEY, OF EAST ST. LOUIS, ILLINOIS, ASSIGNOR TO KEY BOILER EQUIP MENT C0,, 01 EAST ST. LOUIS, ILLINOIS, A. CORPORATION OF MISSOURI.

CAST RETURN BEND FOR OIL STILLS AND METHOD OF MAKING THE SAME.

Application filed May 23,

My invention relates to improvements in cast return bends for oilstills and method of making the same, and has for its primary object a cast return bend for oil stills which is so constructed that the tubes of the still extend entirely through and beyond the face of the casting sothat the casting is materially strengthened.

A further object-1s to construct a cast re-' ,turn bend in which the passage through which both tubes carried by the bend communicate is provided with a lining so that the action of destructive gases during the distillation of oil will not materially affect 6 the casting. 4

A still further object is the method of constructing a return bend for oil stills by means of which method the passage in. the casting can be protected by means of a sleeve formed of corrosion-resisting. metal. Heretofore in the construction of return bends the tubes of the still were only inserted a short distance in the bend, approximately two to two and one-half inches,

2 and when extremely high pressure was developed there was always a possibility of the casting being forced ofif of the end of the tube or broken. By my improved return bend this danger is eliminated because 0 the tube has bearing throughout the casting so that it can not" readily slip off.

Another objection to the old type of return bend was that the destructive gases generated during the distillation of the oil as seriously aifected the casting, corroding it and necessitating its frequent replacement, this replacement being in addition to the replacing of the tubes. By my improved return bend practically all the corrosion takes place in the tube'so that the life of the casting is materially increased and the replacement of the tubes only being necessary.

In the drawings:

Fig. 1 is a vertical longitudinal section of a'return bend showing the same as cast;

Fig. 2 is a similar view showing the sleeve which forms the communicating passage in position, and one of the tubes in position and tapered to receive the cap;

Fig. 3 is a vertical section taken on the line 3-3 of Fig. 2 showing the cap in p0 sition;

Fig. 4 is an end view of the return ben with the caps in position; and

M Fig. 5 is a horizontal section of a return 1927. Serial No. 193,473.

bend in which the protecting sleeve has been omitted.

In the-construction of m device I employ a casting 6 which is provi ed with openings 7. These openings extend laterally of the casting adjacent one end of the casting and located on opposite sides of the openings 7 are ears 8. These ears are provided with slots 9, the purpose of which will be explained in detail later.

Extending longitudinally through the casting and communicating with the openings 7 in an opening 10 and through the outer walls are openings 11. These openings 11 are for the purpose of permitting the insertion of a boring bar so that the opening 10 can be enlarged sufliciently to permit the sleeve 12 to be inserted therein. This sleeve is preferably formed of chromium as it offers great-resistance to corro sion of all kinds. The sleeve-12 is secured .in position by means of a tube expander.

The ends 15 of the tubes 13 project beyond the casting 6 and are located between oppositely disposed ears 8. The end of the tube is then taper-reamed as at 16 so as to form a seat for the tapered cap'17. The tapered cap 17 is held in position by means of a screw 18, which screw is carried by a yoke 19, the yoke 19 being inserted in the openings 9 of oppositely disposed ears 8. See Figs. 3 and 4.

In Fig. 5 I have shown a modified form in which a assageway 20 is formed in the casting 6. hispassageway however is not lined as in certaln instances this lining may not be desirable. However the balance of the construction is the same.

When the boring bar is used to enlarge the passage 10, the bar is inserted through the openings 11 after which a cutter. blade is placed in the bar and secured therein in the usual manner. The device is then placed in a drill press and the pasasge 10 enlarged sufficiently to receive thesleeve 12.

posite opening 7 after Whichthe mandrel iswithdrawn and the expander head removed. In this Way the tube will be seated fairly tight in the opening 10, extremely tight seating not being necessary because as disclosed in Fig. 2 the ends of the tube 12 are protected by the tubes 13 so that there will be very little possibilit of any corrosive gases entering between t a sleeve or tube 12 and the enlarged bore 10.

In order to insure a tight fit between the ends of the sleeve or tube 12 and the tubes 13, the openings 7 are not finished until 7 after the sleeve 12 has been rolled so that in case any elongation takes place, the finishing of the openings 7 will also trim oil the ends of the tube 12.

An important feature of my invention is that by extending the tubes entirely through the return bend the casing surrounding these tubes will be materially relieved from the strain caused b expansion. In other words, I will be enab ed. to employ a much lighter casting than at present is used and by reason of the steel tubes, which are considerably tougher and will withstand a greater tensile strain than the casting, increase the tensile strength against lateral strain of the casting.

It will also be noted from Figs. 2 and 3 that that portion of the tubes adjacent each end of the casting is slightly increased in dlameter so as to form a shoulder which further will tend to from being pushed ofi of the tubes.

Having fully described my invention, what I claim is 1.; A cast return bend for oil stills comprising a casting having a pair of laterally extending parallel openings formed therethrough, a passageway for connecting said openings intermediate their ends, tubes-located in said laterally extending openin and having their ends extending beyon said casting, said tubes havlng openings formed in their walls in alignment with said passageway whereby said tubes communicate with each other within the casting, caps for closing the ends of said tubes, and means carried by said casting for holding said caps 1n position.

2. A cast return bend for oil stills comh prising a casting having a pair of laterall extending parallel openings formed therethrough, a passa eway for connecting said openings interme iate their ends, a sleeve loca ed in Said passageway, tubes loca ed in restrain the casting said laterally extending openings and having their ends extending beyond said casting, said tubes having openings formed in their walls in alignment with said passageway whereby said tubes communicate with each other within the casting, caps forclosing the ends of said tubes, and means carried by said casting for holding said caps in I position.

3. A cast return bend for oil stills comprisin a casting having a pair of laterally extenclng parallel openings formed therethrough, a passageway for connecting said openings intermediate their ends, tubes located in said laterally extending openings and having their ends extending beyond said casting, said tubes having openings formed in their walls in alignment with said passageway whereby sald tubes communicate with each other within the casting, caps for closing the ends of said tubes, ears carried by said casting and projecting laterally beyond one end thereof, and means carried by said ears for holding said caps in position.

4. A cast return bend for oil stills comprisin a casting having a pair of laterally end thereof, and means carried by said'ears for holding said. caps in position.

5. The method of making cast return bends which consists in taking a casting having a pair of parallel openings extending laterally therethrough and longitudinally axially aligned openings at right angles to and intermediate the ends of the first mentioned openings. enlarging the opening between the parallel openings, enlarging the parallel openings, inserting tubes through said parallel openings 'so that their ends will project beyond the casting, subjecting said tubes to radially-and outwardly directed pressure for seating the tubes in the casting, I

forming av tapered seat in the ends of said tubes and then forming openings in the walls of said. tubes coinciding with the opening between the parallel openings.-

6. The method of making cast return bends which consists in taklng a casting aving a pair of parallel openings extending y laterally therethrough and havlng longitudinally extending axially aligned openings at right angles to and intermediate the ends of the first mentioned openings, enlarging the opening between the parallel openings,

inserting a sleeve in said enlarged opening, in the casting, forming a tapered seat in securing said sleeve in said opening by an the projecting ends of said tubes, and then outwardly directed radially exerted pressure, forming openings in the walls of said tubes enlarging the parallel openings and siniulcoinciding with and of the same diameter as 5 taneously therewith trimming the ends of the interior diameter of the sleeve which has 1 said sleeve, inserting tubes through said been inserted between the parallel openings. parallel openings so that one end thereof In testimony whereof I have affixed my will project beyond the end of the casting, signature.

subjecting said tubes to outwardly and ra- 10 dially exerted pressure for seating the tubes FREDERICK E. KEY. 

